Effect of Additive on Microstructure of Transparent YAG Ceramics

稀土学报(英文版), 2005, 23(3): 288-291.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China

2.School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China

3.School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China

4.School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China

5.School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China

6.Department of Mechanical Engineering, Florida Atlantic University, USA

基金项目: 国家优秀青年学者奖励计划国家自然科学基金(50372009)

Effect of Additive on Microstructure of Transparent YAG Ceramics

Keywords： inorganic materials

Transparent YAG (yttrium aluminum garnet) ceramics were fabricated by solid-state reaction method. Effect of additive (tetraethyl orthosilicate, TEOS) on microstructure of YAG ceramics was investigated. If the addition of TEOS is more than 3% (mass fraction), large amount of liquid phase can be yielded at grain boundaries, resulting in the formation of second phase particles at grain boundaries. If the addition is less than 0.05% (mass fraction), pores are entrapped in the grains. The suitable amount is 0.5% (mass fraction). A fully transparent YAG ceramic was fabricated by vacuum sintering at 1700 ℃ for 5 h. Optical transmittance of the YAG ceramic is 63% in the visible light wavelengths and 70% in the infrared wavelengths.

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Effect of Additive on Microstructure of Transparent YAG Ceramics

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